Change RRSet TTL

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

The description discloses a meaningful behavioral trait beyond the idempotentHint annotation: passing null resets to the zone's default TTL. It does not contradict the annotation, though it omits details about error behavior or whether existing records are preserved.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Two concise sentences with the action front-loaded. No filler or repetition; every sentence adds value.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the simple single-purpose mutation, the schema fully documents all four parameters, and the idempotentHint annotation covers repeat-safety, the description is adequate. It could mention return values or missing-RRSet errors, but those are not essential for this low-complexity tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, with each parameter already described in detail. The description's null-fallback note duplicates the ttl schema description, adding little new information that the schema does not already provide.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description uses a specific verb and resource ('Change the Time To Live (TTL) of an RRSet') and adds the key null-fallback detail. It clearly distinguishes itself from sibling tools such as change_zone_ttl and change_rrset_protection.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies the use case (changing an RRSet's TTL) and provides a specific usage pattern ('Pass null to fall back'), but it does not explicitly state when not to use this tool or mention alternatives like update_rrset. No exclusions or comparisons to siblings are provided.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.